PSI - Issue 28

Sahand P. Shamchi et al. / Procedia Structural Integrity 28 (2020) 1664–1672 Sahand Shamchi et al. / Structural Integrity Procedia 00 (2020) 000 – 000

1672

9

The recorded images from the high-speed camera confirms a valid failure of all the specimens within the gauge section during the first stress pulse. The results showed a significant rate dependency on the longitudinal compressive strength and failure strain values of both material configurations. The loading rate appears to have a negligible effect on the compressive modulus of both material configurations. Also, the incorporation of an electrically functionalized carrier into the UD carbon/epoxy laminate was found to lower the stiffness value of the material, regardless of the exposed strain rate. Future work will address the material´s response subjected to a through-thickness impact loading, examining the effect of interleaving the conductive film on the interlaminar fracture toughness of the UD carbon/epoxy composite system. Acknowledgements This work was supported by Fundação para a Ciência e a Tecnologia (FCT) under NANOPOL project reference JICAM/0002/2017. References [1] F. A. Fisher and and J. A. Plumer, Lightning Protection of Aircraft . NASA Reference Publication 1008, 1977. [2] M. Gagné and D. Therriault, “Lightning strike protection of composites,” Prog. Aerosp. Sci. , vol. 64, pp. 1 – 16, 2014. [3] S. Stankovich et al. , “Graphene - based composite materials,” vol. 442, no. July, pp. 282– 286, 2006. [4] P. Mukhopadhyay and R. Gupta, “Trends and frontiers in graphene - based polymer nanocomposites,” Plast. Eng. , vol. 67, no. 1, pp. 32 – 42, 2011. [5] D. Chung, Carbon composites: composites with carbon fibers, nanofibers, and nanotubes , Second ed. Butterworth-Heinemann, 2017. [6] W. Bauhofer and J. Z. Kovacs, “A review and analysis of electrical percolation in carbon nanotube polymer composites,” Compos. Sci. Technol. , vol. 69, no. 10, pp. 1486 – 1498, 2009. [7] X. Yi, M. Guo, G. Liu, W. Zhao, L. Liu, and H. Cul, “Composite conductive sheet, fabricating method and application thereof,” EP2687364B1. [8] X. S. Yi, “Development of multifunctional composites for aerospace application,” in Multifunctionality of Polymer Composites , Elsevier, 2015, pp. 367 – 418. [9] ISO 14126, Fibre-reinforced plastic composites — Determination of compressive properties in the in-plane direction . International Organization for Standardization, Geneva, Switzerland, 1999. [10] M. Ploeckl, P. Kuhn, J. Grosser, M. Wolfahrt, and H. Koerber, “A dynamic test methodology for analyzing the strain -rate effect on the longitudinal compressive behavior of fiber- reinforced composites,” Compos. Struct. , vol. 180, pp. 429 – 438, 2017. [11] G. T. GrayIII, “Classic Split - Hopkinson Pressure Bar Testing,” in ASM handbook: Mechanical Testing and Evaluation , vol. 8. Materials Park, OH, 2000. [12] S. Nemat-Nass er, J. B. Isaacs, and J. E. Starrett, “Hopkinson Technique for Dynamic Recovery Experiments,” Proc. R. Soc. London A Math. Phys. Eng. Sci. , vol. 435, no. 1894, pp. 371 – 391, 1991.